infrasonic

[in-fruh-son-ik] /ˌɪn frəˈsɒn ɪk/
adjective
1.
noting or pertaining to a sound wave with a frequency below the audio-frequency range.
Origin
1925-30; infra- + sonic
Examples from the web for infrasonic
  • The atmospheric structure responsible for the transport of infrasonic energy can change rapidly in both time and space.
  • infrasonic and near-infrasonic signatures may provide advanced warning and monitoring of these extreme events.
  • infrasonic sound is always present in the environment.
Word Origin and History for infrasonic
adj.

1927, from infra- + sonic.

infrasonic in Medicine

infrasonic in·fra·son·ic (ĭn'frə-sŏn'ĭk)
adj.
Generating or using waves or vibrations with frequencies below that of audible sound.

infrasonic in Science
infrasound
  (ĭn'frə-sound')   
Sound whose wave frequency is too low (under 15-20 hertz) to be heard by humans. Some animals, such as elephants and whales, emit calls at infrasound frequencies. See Note at ultrasound.

infrasonic adjective